US7869693B2 - Method and apparatus of recording digital data stream, and a recording medium containing data recorded through said method - Google Patents
Method and apparatus of recording digital data stream, and a recording medium containing data recorded through said method Download PDFInfo
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- US7869693B2 US7869693B2 US10/172,798 US17279802A US7869693B2 US 7869693 B2 US7869693 B2 US 7869693B2 US 17279802 A US17279802 A US 17279802A US 7869693 B2 US7869693 B2 US 7869693B2
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
- H04N9/8042—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/84—Television signal recording using optical recording
- H04N5/85—Television signal recording using optical recording on discs or drums
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/7921—Processing of colour television signals in connection with recording for more than one processing mode
- H04N9/7925—Processing of colour television signals in connection with recording for more than one processing mode for more than one standard
Definitions
- the present invention relates to method and apparatus of recording digital data stream on a recording medium such as a high-density digital versatile disk (called ‘HD-DVD’ hereinafter).
- a recording medium such as a high-density digital versatile disk (called ‘HD-DVD’ hereinafter).
- the present invention further relates a recording medium on which digital data stream has been written in accordance with said method.
- audio/video (A/V) signals to be broadcasted are compressed according to the data compressing rule specified by MPEG 2 (Moving Picture Experts Group) and the compressed A/V data are broadcasted in the form of transport stream (TS), which is also defined in MPEG 2 standard, composed of series of 188-byte-long transport packets (TPs).
- TS transport stream
- the digital TV broadcast system which will be commercialized soon owing to technical improvement of A/V data compression and transmission, is able to support much higher-quality of video and audio than analog TV system. Furthermore, it ensures data compatibility with a digital communication device, a digital storage device, etc.
- Digital A/V data compressed in the manner of MPEG 2 for the digital TV broadcast system are composed of I-(Intra-), P-(Predictive-), and B-(Bidirectionally predictive-) pictures.
- An I picture is a basic one and a P or a B picture can be presented as a video frame if there is an associated I picture.
- the compressed digital A/V data are divided to insert in each payload field of series of 188-byte-long (inclusive of header) TPs which are broadcasted sequentially.
- the digital recorder would record the TPs carrying TV broadcast programs on a writable HD-DVD in the same order as they are received.
- a predetermined-sized, e.g., 4-byte time stamp indicative of packet arrival time may be added to each TP.
- the digital recorder groups those packs into a single ‘high-density stream object unit’ (called ‘HOBU’ hereinafter) and creates and writes search information for that HOBU as navigation data.
- the search information includes location or location-associated time information pointing to the head of a HOBU.
- the head of each HOBU is not aligned with the start of an arbitrary picture as shown in FIG. 1 .
- digital data stream has been recorded as shown in FIG. 1
- the digital recorder searches the recorded digital data stream for a certain scene equivalent to a picture a user wants to view, it searches as jumping in the unit of HOBU with reference to the stored search information for all HOBUs.
- a HOBU includes the rest data of a previous picture in its head area as shown in FIG. 1
- a complete video frame can not be constructed from the data in the head area. Therefore, the digital recorder must discard the rest data of a previous picture in the current HOBU and obtain a complete picture data from successive TPs following the discard data. After the obtained complete picture data are presented as a video frame, the digital recorder may confirm whether or not reproduction is to be started from the presented picture based on user's command, e.g., ‘continue searching’ or ‘play’.
- a method of recording digital data stream on a recording medium in accordance with the present invention is characterized in that it comprises the steps of searching digital data stream containing video signals for each picture section; packetizing a data section including at least one picture section found in said searching step into a first-typed packet; and slicing the first-typed packet to make the sliced data pieces to a plurality of second-typed packets, and writing the plurality of second-typed packets within a stream object unit if the stream object unit has a space enough to store the plurality of second-typed packets, or from head point of a next stream object unit if not.
- An apparatus of recording digital data stream on a recording medium in accordance with the present invention is characterized in that it comprises: a first packetizer searching digital data stream containing video signals for each picture section and packetizing a data section including at least one among found picture sections into a first-typed packet; a second packetizer slicing the first-typed packet made by said first packetizer to make the sliced data pieces to a plurality of second-typed packets; and a data writer writing the plurality of second-typed packets made from the first-typed packet by said second packetizer within a stream object unit if the stream object unit has a space enough to store the plurality of second-typed packets, or from head point of a next stream object unit if not, wherein data of every second-typed packet are converted to writing suitable format by said data writer before written on a recording medium.
- a recording medium in accordance with the present invention is characterized in that it includes data recorded thereon are grouped into a plurality of stream object units, wherein the stream object unit begins with start data of a picture equivalent to a video frame.
- FIG. 1 shows an example of data format formed by a conventional recording method in which transport stream is recorded as received
- FIG. 2 is a block diagram of an embodiment of a digital recorder recording digital data stream on a writable medium in accordance with the present invention.
- FIG. 3 shows a schematic process of recording received A/V data stream in accordance with the present invention.
- FIG. 2 is a block diagram of an embodiment of a digital recorder recording digital data stream on a writable medium in accordance with the present invention.
- the digital recorder of FIG. 2 which may be a video disk recorder (called ‘VDR’) being able to write digital A/V data on a writable HD-DVD, comprises an A/V stream converter 10 converting received A/V signal to A/V data stream compressed according to MPEG 2 standard; an A/V stream separator 11 separating the compressed A/V data stream into audio and video stream; a PES packetizer 12 packetizing the audio and the video stream into PES (Packetized Elementary Stream) packets defined in MPEG 2 standard, respectively; a TS packetizer 13 slicing the video and the audio PES packets, respectively, to make respective series of TPs, and multiplexing the respective series of video and audio TPs into a single TS; a writing processor 14 re-formatting the TS from the TS packetizer 13 to record/reproduction suitable structure and outputting disk writing signals corresponding to re-formatted data; an optical pickup 15 forming marks and spaces along a track of an inserted wr
- the A/V stream converter 10 if a digital TV broadcast program formatted in TS is received, extracts compressed A/V data stream from the TS through decoding successive TPs. However, if non-MPEG formatted program stream broadcasted by other standard of digital TV broadcast system, e.g., DirecTV is received, the A/V stream converter 10 conducts decoding algorithm suitable to that system to extract A/V data, and compresses the extracted A/V data again according to data compressing rule of MPEG 2 standard. If an analog A/V signal is received, the A/V stream converter 10 digitizes audio and video signal, respectively, and conducts MPEG 2 compressing operation for the respective digitized signal.
- non-MPEG formatted program stream broadcasted by other standard of digital TV broadcast system e.g., DirecTV
- the A/V stream converter 10 conducts decoding algorithm suitable to that system to extract A/V data, and compresses the extracted A/V data again according to data compressing rule of MPEG 2 standard. If an analog A/
- FIG. 3 shows a schematic process of recording received A/V data stream in accordance with the present invention.
- a received data stream of an arbitrary format is converted to MPEG 2-compressed data stream 301 by the A/V stream converter 10 .
- the PES packetizer 12 at the next stage analyzes video stream of the A/V data stream 301 to search for every I-, P-, and B-picture section, and composes a PES packet with at least one picture section.
- the PES packetizer 12 also composes a PES packet with audio data stream of each frame group.
- PES Presentation Time Stamp
- DTS Decoding Time Stamp
- the PES packetizer 12 outputs a data stream 302 shown in FIG. 3 .
- the PES packetizer 12 When the PES packetizer 12 transmits the composed data stream 302 to the TS packetizer 13 , it also sends a ‘PES packet start signal’ (PPSS) indicative of transmission of start data of a video PES packet, in the strict sense, PES header of a video PES packet to the TS packetizer 13 .
- PPSS PES packet start signal
- the TS packetizer 13 slices the video and the audio PES packets, respectively, to make two series of video and audio TPs, and multiplexes the video and the audio TPs into a single TS 303 which is depicted in FIG. 3 .
- the TS packetizer 13 starts to insert just-received data in payload field of the next video TP, namely, it creates a new TP and writes data received concurrently with the PPSS in the created new TP. If a current video TP is not fully filled with received data at the time when the PPSS is received, its remaining area is padded with null data.
- the elliptic zones 303 a in FIG. 3 show partially null-padded TPs through the above operations of the TS packetizer 13 .
- the TS packetizer 13 delivers TPs to the writing processor 14 in the same order as they are multiplexed. If a TP being delivered at present contains start data of a sliced PES packet, then the TS packetizer 13 notifies the writing processor 14 of that fact by sending PES starting TP signal (PSTS) concurrently to the writing processor 14 .
- PSTS PES starting TP signal
- the writing processor 14 gathers the received TPs. Whenever the PSTS is received from the TS packetizer 13 , the writing processor 14 checks whether or not TPs gathered until now are larger than the size of a single HOBU, a grouping unit of the writable HD-DVD 16 . If not greater, the writing processor 14 only memorizes the location, e.g., ‘SB i ’ of a TP received at the same time as the PSTS, and continues to gather the TPs received thereafter.
- the location e.g., ‘SB i ’ of a TP received at the same time as the PSTS
- the writing processor 14 re-formats the gathered TPs excluding back TPs placed from a previously-memorized position ‘SB i ’ to form writing data group for a single HOBU, and modulates and outputs the formed writing data group.
- the size of writing data group formed for a single HOBU is less than the capacity of a single HOBU because of the exclusion of back TPs which would cause, if included in the writing data group, the whole gathered TPs to exceed the capacity of a HOBU. Therefore, the writing processor 14 generates additional null data of which size is equal to the remaining capacity of a HOBU.
- the generated null data follows the outputted writing data group and are written in the remaining area of the HOBU.
- the null data padded in the HOBU are sure to prevent possible reproducing or decoding errors.
- Next successive TPs are gathered to the remaining TPs not included in the formed writing data group for a HOBU, namely, TPs existing from the previously-memorized position ‘SB i ’ to the just-received position ‘SB i+1 ’ and the latest TP received concurrently with the PSTS, and they will be written in the next HOBU when the gathered size is greater than the capacity of a single HOBU. Consequently, the next HOBU will also begin with start data of a picture, in the strict sense, header of a PES packet of which data field begins with start data of a picture.
- the modulated signals outputted from the writing processor 14 are written in the form of marks and spaces on the writable HD-DVD 16 through the optical pickup 15 .
- the writing processor 14 informs the controller 17 of the writing data group formation for a single HOBU and the number of the PSTSs received until the writing data group formation.
- the controller 17 continuously receives and stores PTSs written in the PES header of each PES packet by the PES packetizer 12 .
- the controller 17 calculates a PTS time length of the present writing data group formed for a single HOBU based on the stored PTSs of every PES packet to create search information for that HOBU.
- the search information may include PTS time length of each HOBU and accumulated PTS time length up to each HOBU (it need not size information and accumulated size information of each HOBU if the size of a HOBU is constant).
- the search information will be created for each HOBU-sized data, and it is transmitted to the writing processor 14 to be written on a pre-assigned area as navigation data in the middle of A/V data recording operation or after A/V data recording is done.
- the received A/V data stream forms a data written format 304 on the writable HD-DVD 16 as shown in FIG. 3 .
- the head of each HOBU is aligned with the start data of a PES packet, namely, the start of an arbitrary picture.
- the controller 17 in search mode, identifies a certain HOBU using the navigation data and accesses the identified HOBU, an additional minute searching operation for a picture start is not necessary because the start of the identified HOBU is exactly a picture start.
- the above-explained data stream recording format 304 of FIG. 3 is applicable to a read-only HD-DVD which stores A/V data stream in the form of pre-pits. Namely, A/V data stream is formed on a read-only HD-DVD in the manner that each HOBU begins with picture start data. In addition, search information for each HOBU is recorded in a navigation data area or as a navigation data file.
- A/V data stream when A/V data stream is written on a conventional read-only DVD, it is packetized into PES packets in the manner that one PES packet is written in one sector.
- a stream section including at least one picture, of which size is quite larger than that of a sector of a conventional read-only DVD is packetized into one PES packet. Therefore, the number of PES headers added to each PES packet is reduced considerably in comparison with the A/V data stream recording scheme conducted for a conventional read-only DVD.
- the above-explained A/V data stream recording method and apparatus, and a recording medium in which A/V data stream has been recorded through said method can improve random accessibility of recorded A/V data stream and increase the actual data recording efficiency of a high-density recording medium in comparison with recording format of a conventional read-only DVD.
Abstract
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Priority Applications (1)
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US11/001,172 US8265462B2 (en) | 2001-06-15 | 2004-12-02 | Recording medium having a data structure for managing a transport stream recorded thereon and methods and apparatuses for recording and reproducing |
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KR2001-0034009 | 2001-06-15 | ||
KR10-2001-0034009A KR100470025B1 (en) | 2001-06-15 | 2001-06-15 | Apparatus and method for recording a digital data stream, and medium thereof |
KR2001-34009 | 2001-06-15 |
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US11/001,172 Continuation US8265462B2 (en) | 2001-06-15 | 2004-12-02 | Recording medium having a data structure for managing a transport stream recorded thereon and methods and apparatuses for recording and reproducing |
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US20020191115A1 US20020191115A1 (en) | 2002-12-19 |
US7869693B2 true US7869693B2 (en) | 2011-01-11 |
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US10/172,798 Expired - Fee Related US7869693B2 (en) | 2001-06-15 | 2002-06-14 | Method and apparatus of recording digital data stream, and a recording medium containing data recorded through said method |
US11/001,172 Expired - Fee Related US8265462B2 (en) | 2001-06-15 | 2004-12-02 | Recording medium having a data structure for managing a transport stream recorded thereon and methods and apparatuses for recording and reproducing |
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JP (1) | JP3949009B2 (en) |
KR (1) | KR100470025B1 (en) |
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CN1209703C (en) * | 2003-10-16 | 2005-07-06 | 上海广电(集团)有限公司中央研究院 | Organization method for random access data flow and its corresponding decoding method |
KR101022112B1 (en) | 2004-03-12 | 2011-03-17 | 엘지전자 주식회사 | Recording and playback control method of transport stram data |
KR101071139B1 (en) * | 2004-12-09 | 2011-10-10 | 엘지전자 주식회사 | Structure of navigation information for video data recorded on a recording medium and recording/reproducing method and apparatus using the structure |
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Also Published As
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KR20020095797A (en) | 2002-12-28 |
KR100470025B1 (en) | 2005-02-04 |
JP2003069953A (en) | 2003-03-07 |
JP3949009B2 (en) | 2007-07-25 |
US20020191115A1 (en) | 2002-12-19 |
US8265462B2 (en) | 2012-09-11 |
CN1242616C (en) | 2006-02-15 |
CN1396595A (en) | 2003-02-12 |
CN1722281B (en) | 2010-07-07 |
US20050084249A1 (en) | 2005-04-21 |
CN1722281A (en) | 2006-01-18 |
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